Sticky post doesn't work

Hi, I tried to use sticky post but it doesn't work or I doing something wrong. http://demo.raznirecepti.com/demo/ go to main menu "Skupsinta stanara" and choose first submenu link "Seboj A". There you will find 3 latest post: seboj a standard post 1 seboj a standard post 2 seboj a standard post 3 if you click on link "Starije poruke"(Older post) you will see "seboj A sticky post". If I understand correctly sticky post will remain as first post (on first page of Seboj A posts) until publishing a new sticky post. rgds Djapeto